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/*
* arch/arm/mach-tegra/baseband-xmm-power2.c
*
* Copyright (C) 2011 NVIDIA Corporation
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <mach/usb_phy.h>
#include "baseband-xmm-power.h"
#include "board.h"
#include "devices.h"
MODULE_LICENSE("GPL");
static struct baseband_power_platform_data *baseband_power2_driver_data;
static enum {
IPC_HSIC_SUS_REQ_UNINIT,
IPC_HSIC_SUS_REQ_IRQ_READY,
IPC_HSIC_SUS_REQ_INIT,
IPC_HSIC_SUS_REQ_L,
IPC_HSIC_SUS_REQ_H,
} ipc_hsic_sus_req_state;
static enum {
IPC_AP_WAKE_UNINIT,
IPC_AP_WAKE_IRQ_READY,
IPC_AP_WAKE_INIT1,
IPC_AP_WAKE_INIT2,
IPC_AP_WAKE_L,
IPC_AP_WAKE_H,
} ipc_ap_wake_state;
static struct workqueue_struct *workqueue;
static struct work_struct init1_work;
static struct work_struct init2_work;
static irqreturn_t ipc_hsic_sus_req_irq(int irq, void *dev_id)
{
int value;
pr_debug("%s\n", __func__);
/* check for platform data */
if (!baseband_power2_driver_data)
return IRQ_HANDLED;
/* IPC_HSIC_SUS_REQ state machine */
if (ipc_hsic_sus_req_state < IPC_HSIC_SUS_REQ_IRQ_READY) {
pr_err("%s - spurious irq\n", __func__);
} else {
value = gpio_get_value(baseband_power2_driver_data->
modem.xmm.ipc_hsic_sus_req);
if (!value) {
pr_debug("%s - falling\n", __func__);
ipc_hsic_sus_req_state = IPC_HSIC_SUS_REQ_L;
} else {
pr_debug("%s - rising\n", __func__);
ipc_hsic_sus_req_state = IPC_HSIC_SUS_REQ_H;
}
}
return IRQ_HANDLED;
}
static irqreturn_t ipc_ap_wake_irq(int irq, void *dev_id)
{
int value;
pr_debug("%s\n", __func__);
/* check for platform data */
if (!baseband_power2_driver_data)
return IRQ_HANDLED;
/* IPC_AP_WAKE state machine */
if (ipc_ap_wake_state < IPC_AP_WAKE_IRQ_READY) {
pr_err("%s - spurious irq\n", __func__);
} else if (ipc_ap_wake_state == IPC_AP_WAKE_IRQ_READY) {
value = gpio_get_value(baseband_power2_driver_data->
modem.xmm.ipc_ap_wake);
if (!value) {
pr_debug("%s - IPC_AP_WAKE_INIT1 - got falling edge\n",
__func__);
/* go to IPC_AP_WAKE_INIT1 state */
ipc_ap_wake_state = IPC_AP_WAKE_INIT1;
/* queue work */
queue_work(workqueue, &init1_work);
} else {
pr_debug("%s - IPC_AP_WAKE_INIT1 - wait for falling edge\n",
__func__);
}
} else if (ipc_ap_wake_state == IPC_AP_WAKE_INIT1) {
value = gpio_get_value(baseband_power2_driver_data->
modem.xmm.ipc_ap_wake);
if (!value) {
pr_debug("%s - IPC_AP_WAKE_INIT2 - wait for rising edge\n",
__func__);
} else {
pr_debug("%s - IPC_AP_WAKE_INIT2 - got rising edge\n",
__func__);
/* go to IPC_AP_WAKE_INIT2 state */
ipc_ap_wake_state = IPC_AP_WAKE_INIT2;
/* queue work */
queue_work(workqueue, &init2_work);
}
} else {
value = gpio_get_value(baseband_power2_driver_data->
modem.xmm.ipc_ap_wake);
if (!value) {
pr_debug("%s - falling\n", __func__);
ipc_ap_wake_state = IPC_AP_WAKE_L;
} else {
pr_debug("%s - rising\n", __func__);
ipc_ap_wake_state = IPC_AP_WAKE_H;
}
}
return IRQ_HANDLED;
}
static void baseband_xmm_power2_init1_work(struct work_struct *work)
{
int value;
pr_debug("%s {\n", __func__);
/* check for platform data */
if (!baseband_power2_driver_data)
return;
/* check if IPC_HSIC_ACTIVE high */
value = gpio_get_value(baseband_power2_driver_data->
modem.xmm.ipc_hsic_active);
if (value != 1) {
pr_err("%s - expected IPC_HSIC_ACTIVE high!\n", __func__);
return;
}
/* wait 30 ms */
mdelay(30);
/* set IPC_HSIC_ACTIVE low */
gpio_set_value(baseband_power2_driver_data->
modem.xmm.ipc_hsic_active, 0);
pr_debug("%s }\n", __func__);
}
static void baseband_xmm_power2_init2_work(struct work_struct *work)
{
int value;
pr_debug("%s {\n", __func__);
/* check for platform data */
if (!baseband_power2_driver_data)
return;
/* check if IPC_HSIC_ACTIVE low */
value = gpio_get_value(baseband_power2_driver_data->
modem.xmm.ipc_hsic_active);
if (value != 0) {
pr_err("%s - expected IPC_HSIC_ACTIVE low!\n", __func__);
return;
}
/* wait 1 ms */
mdelay(1);
/* turn on usb host controller */
{
mm_segment_t oldfs;
struct file *filp;
oldfs = get_fs();
set_fs(KERNEL_DS);
filp = filp_open("/sys/devices/platform/tegra-ehci.1/ehci_power", O_RDWR, 0);
if (!filp) {
pr_err("open ehci_power failed\n");
} else {
filp->f_op->write(filp, "1", 1, &filp->f_pos);
filp_close(filp, NULL);
}
set_fs(oldfs);
}
/* set IPC_HSIC_ACTIVE high */
gpio_set_value(baseband_power2_driver_data->
modem.xmm.ipc_hsic_active, 1);
/* wait 20 ms */
mdelay(20);
/* set IPC_HSIC_ACTIVE low */
gpio_set_value(baseband_power2_driver_data->
modem.xmm.ipc_hsic_active, 0);
/* wait 20 ms */
mdelay(20);
/* set IPC_HSIC_ACTIVE high */
gpio_set_value(baseband_power2_driver_data->
modem.xmm.ipc_hsic_active, 1);
pr_debug("%s }\n", __func__);
}
static int baseband_xmm_power2_driver_probe(struct platform_device *device)
{
struct baseband_power_platform_data *data
= (struct baseband_power_platform_data *) device->dev.platform_data;
int err;
pr_debug("%s\n", __func__);
/* save platform data */
baseband_power2_driver_data = data;
/* request baseband irq(s) */
ipc_hsic_sus_req_state = IPC_HSIC_SUS_REQ_UNINIT;
err = request_irq(gpio_to_irq(data->modem.xmm.ipc_hsic_sus_req),
ipc_hsic_sus_req_irq,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
"IPC_HSIC_SUS_REQ_IRQ",
NULL);
if (err < 0) {
pr_err("%s - request irq IPC_HSIC_SUS_REQ_IRQ failed\n",
__func__);
return err;
}
ipc_hsic_sus_req_state = IPC_HSIC_SUS_REQ_IRQ_READY;
ipc_ap_wake_state = IPC_AP_WAKE_UNINIT;
err = request_irq(gpio_to_irq(data->modem.xmm.ipc_ap_wake),
ipc_ap_wake_irq,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
"IPC_AP_WAKE_IRQ",
NULL);
if (err < 0) {
pr_err("%s - request irq IPC_AP_WAKE_IRQ failed\n",
__func__);
return err;
}
ipc_ap_wake_state = IPC_AP_WAKE_IRQ_READY;
/* init work queue */
workqueue = create_singlethread_workqueue
("baseband_power_workqueue");
if (!workqueue) {
pr_err("cannot create workqueue\n");
return -1;
}
INIT_WORK(&init1_work, baseband_xmm_power2_init1_work);
INIT_WORK(&init2_work, baseband_xmm_power2_init2_work);
return 0;
}
static int baseband_xmm_power2_driver_remove(struct platform_device *device)
{
pr_debug("%s\n", __func__);
/* check for platform data */
if (!baseband_power2_driver_data)
return 0;
/* free baseband irq(s) */
free_irq(gpio_to_irq(baseband_power2_driver_data
->modem.xmm.ipc_ap_wake), NULL);
free_irq(gpio_to_irq(baseband_power2_driver_data
->modem.xmm.ipc_hsic_sus_req), NULL);
return 0;
}
#ifdef CONFIG_PM
static int baseband_xmm_power2_driver_suspend(struct platform_device *device,
pm_message_t state)
{
pr_debug("%s\n", __func__);
/* check for platform data */
if (!baseband_power2_driver_data)
return 0;
/* signal bb to suspend hsic */
gpio_set_value(baseband_power2_driver_data
->modem.xmm.ipc_hsic_active, 0);
return 0;
}
static int baseband_xmm_power2_driver_resume(struct platform_device *device)
{
pr_debug("%s\n", __func__);
/* check for platform data */
if (!baseband_power2_driver_data)
return 0;
/* wake bb */
gpio_set_value(baseband_power2_driver_data
->modem.xmm.ipc_bb_wake, 1);
/* signal bb to resume hsic */
gpio_set_value(baseband_power2_driver_data
->modem.xmm.ipc_hsic_active, 1);
return 0;
}
#endif
static struct platform_driver baseband_power2_driver = {
.probe = baseband_xmm_power2_driver_probe,
.remove = baseband_xmm_power2_driver_remove,
#ifdef CONFIG_PM
.suspend = baseband_xmm_power2_driver_suspend,
.resume = baseband_xmm_power2_driver_resume,
#endif
.driver = {
.name = "baseband_xmm_power2",
},
};
static int __init baseband_xmm_power2_init(void)
{
pr_debug("%s\n", __func__);
return platform_driver_register(&baseband_power2_driver);
}
static int __exit baseband_xmm_power2_exit(void)
{
pr_debug("%s\n", __func__);
platform_driver_unregister(&baseband_power2_driver);
return 0;
}
module_init(baseband_xmm_power2_init)
module_exit(baseband_xmm_power2_exit)
|
